My goal is to be able to sync podcast episodes (the actual audio files) and their play state (played or unplayed, how many minutes I've already listened to) between devices, so I can stop listening to an episode on my phone, for example, and continue listening to the same episode on my desktop computer (continuing from the point in the episode where I stopped listening on my phone).

I'm using AntennaPod on GrapheneOS (Android 14), and for desktop podcast listening I'm using Podfetch (self hosted). I'm also self-hosting a GPodder instance, and in Podfetch I have GPODDER_INTEGRATION_ENABLED set to true.

In AntennaPod, I'm able to configure Synchronization to GPodder.net (though my own instance of GPodder is at a different domain, AntennaPod calls the GPodder configuration "GPodder.net"), enter my self-hosted URL and credentials, and AntennaPod logs in, but it fails to sync. I don't know where AntennaPod's logs are so I don't have any details about why the sync fails.

Also confusing to me is how to manage podcast subscriptions. It seems I can manually add podcasts to either GPodder or Podfetch, but adding a podcast to one doesn't add it to the other. The same happens with episodes: if I manually add the same podcast to both GPodder and Podfetch and download an episode in one environment, the episode isn't also downloaded in the other.

Has anyone successfully got these 3 apps working together? Can you help me figure out what I'm doing wrong?

Thanks!